Question

if a power of lens is -40 its focal length will be​

Answer 1

P = 1/f

=>f = 1/p

= > f = - 1/40 = - 0.25 m

.....Thanka

Answer 2

Answer:

Focal Length = 100/power of lens

Focal Length = 100/-40 = - 2.5 m

Explanation:

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